Power generation:Compatible with bottle type bicycle dynamos with 6 V/3 W and 12 V/3 W output5.0 V/450 mA/15 km/h. Maximum current 70 mACharging starts at ~6 km/h and maximum output is achieved at 25 km/h. Charging stops when the speed reaches 50 km/h.Charging time depends on cycling speed, for example a Nokia 1202 with a 860 mAh battery can be charged with about 20 minutes of cycling at a speed of about 10 km/h (for the Nokia 1202 this would mean approximately 57 mins talk time or 74 h standby time)